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6x-21-7x+13=-10
-8+10=x
x=2
b) -2(-27-3x) = -3(2x -10)
54+6x=-6x+30
6x+6x=30-54
12x=-24
x=-24/12
x=-2
c) 6-2(2x-) = 4x-2( - 3x)
6-4x+1=4x-1,5+6x
7+1,5=10x+4x
14x=8,5
x=8,5/14
x=85/140
x=17/28
d) 3x = x- (1- (x-3))
3x=x-(1-x+3)
3x=x-1+x-3
3x-2x=-4
x=-4
e) 5x - (2x+(3-x)) = 11
5x-(2x+3-x)=11
5x-x-3=11
4x=11+3
x=14/4
x=3,5
f) 1 - (x- (x- (x-1))) = 0
1-(x-(x-x+1))=0
1-(x-1)=0
1-x+1=0
x=2